linux-kernel - Re: [PATCH v2] mtd: spi-nor: Fix address width on flash chips

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Date:   Wed, 7 Oct 2020 07:44:54 +0200
From:   Cédric Le Goater <clg@...d.org>
To:     Joel Stanley <joel@....id.au>, Bert Vermeulen <bert@...t.com>
CC:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mtd: spi-nor: Fix address width on flash chips > 16MB

On 10/7/20 3:51 AM, Joel Stanley wrote:
> On Sun, 4 Oct 2020 at 21:33, Bert Vermeulen <bert@...t.com> wrote:
>>
>> If a flash chip has more than 16MB capacity but its BFPT reports
>> BFPT_DWORD1_ADDRESS_BYTES_3_OR_4, the spi-nor framework defaults to 3.
>>
>> The check in spi_nor_set_addr_width() doesn't catch it because addr_width
>> did get set. This fixes that check.
>>
>> Signed-off-by: Bert Vermeulen <bert@...t.com>
> 
> After replying to the other thread, I just saw this one.
> 
> Reviewed-by: Joel Stanley <joel@....id.au>
> Tested-by: Joel Stanley <joel@....id.au>
> 
> Thanks Bert!


Yes. I was starting to add bfpt-fixups for all chips we use on Aspeed 
based system.

Reviewed-by: Cédric Le Goater <clg@...d.org>
Tested-by: Cédric Le Goater <clg@...d.org>

Thanks,

C. 



> Cheers,
> 
> Joel
> 
>> ---
>>  drivers/mtd/spi-nor/core.c | 8 +++++---
>>  1 file changed, 5 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
>> index 0369d98b2d12..a2c35ad9645c 100644
>> --- a/drivers/mtd/spi-nor/core.c
>> +++ b/drivers/mtd/spi-nor/core.c
>> @@ -3009,13 +3009,15 @@ static int spi_nor_set_addr_width(struct spi_nor *nor)
>>                 /* already configured from SFDP */
>>         } else if (nor->info->addr_width) {
>>                 nor->addr_width = nor->info->addr_width;
>> -       } else if (nor->mtd.size > 0x1000000) {
>> -               /* enable 4-byte addressing if the device exceeds 16MiB */
>> -               nor->addr_width = 4;
>>         } else {
>>                 nor->addr_width = 3;
>>         }
>>
>> +       if (nor->addr_width == 3 && nor->mtd.size > 0x1000000) {
>> +               /* enable 4-byte addressing if the device exceeds 16MiB */
>> +               nor->addr_width = 4;
>> +       }
>> +
>>         if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
>>                 dev_dbg(nor->dev, "address width is too large: %u\n",
>>                         nor->addr_width);
>> --
>> 2.17.1
>>